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Zhurnal Prikladnoi Khimii (Sankt-Peterburg, Russian Federation), 1944 , vol. 17, p. 65,73
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Squibb and Sons
Patent: US2592859 , 1946 ;

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Merck and Co. Inc.
Patent: US2385224 , 1939 ;

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Leitch; Baker; Brickman
Canadian Journal of Research, Section B: Chemical Sciences, 1945 , vol. 23, p. 139,147